now our company is seeking some kinds of connections which is fully interchangeable with PH6 Tenaris Hydril Connections. Could you pls let me know if you have any information like it. we know some information such as name of connection, company owner, contact point ( if any)...

There are two type of connection API and premium connection
API it is standard, any company can seal or can cut and thread with approval.
Premium related to certain company and connection name will be same company name, and no one can cut and thread without owner approval . .